Metal drum



J. KNIGGE April 7, 1931.

METAL DRUM Filed March 28, 1929 Patented Apr. 7, 1931 UNITED STATES PATENT OFFICE JULIUS KNIGGE, OF ESSEN-STADTWALD, GERMANY, ASSIGNOB TO FRIED. KBUPP AITIENGESELLSCHAI'T, OF ESSEN-ON-THE-BUHR, GERIANY METAL DRUM Application fled March 28, 1929, Serial No. 850,871, and in Germany April 28, 1828.

Y invention the proper drum is fixed in the jacket by the ends of its shell abutting on the shell of the jacket and by its front walls abutting onthose of the jacket, these front walls further being arranged, in a manner known in itself, in such a manner that the front walls of the proper drum substantially are protected from being bruised.

In order that the invention can be more easily understood, an embodiment of the no same is illustrated by way of example in the accompanying drawing that shows a metal drum designed according to the in vention in sectional elevation.

Referring to this drawing, A denotes the shell of the pro er drum which shell is of a substantially cy indrical shape and closed at its ends by front walls B. To this end each front wall B has an outwardly extending flange 6 connected to the corresponding 80 outer edge of shell A by welding. The proper drum A B is made of rustless steel and has a wall thickness of about 0.5 mm. so that it possesses sufficient own strength.

The 'acket is made of ordinary mild steeland as a greater wall thickness, about of 2.5 mm. It is composed of a barreled shell C and front walls D. ,Each of the front walls D is provided like the walls B, with a flange, and, more particularly, with a i flange portion d next to wall D the outer diameter of which flange portion is somewhat smaller than the smallest inner diameter of shell 0, the latter having a cylindrical portion 0 on each end. To flange portion (1 is attached a flange portion d the outer diameter of which corresponds to the inner diameter of the cylindrical portion a of shell C with which it is connected by welding. Into the annular gap existing between flange a and the narrowed portion d of flange d d projects flan e b with the respective edge of shell A o the proper drum A B, the outer diameter of this edge corres onding to the inner diameter of the cylinrical portion 0 of the jacket shell C. Each of the front walls I) is provided with an outwardly projecting annular depression d that surrounds a central portion at flush with the edge of the front wall. An inwardly bent flange c finally is arranged on the cylindrical portions 0 of shell C of jacket C D which flange a engages over the flan e portion d of wall D and serves to rein o grce jacket C D. To further reinforce 5 the la ter, beads E of semicircular cross section are provided on shell 0.

The described drum possesses in the usual manner a bung hole, and a spile hole in one of the front walls B. The s ile hole is arran ed in a socket F welde onto wall B of t e proper drum and projecting through an aperture (2 of wall D of the jacket, the socket F carrying a nut G on its outer end. Between the drum and the jacket socket F is surrounded by an intermediate ring H and above the jacket by a packing ring J which can be tightened by nut G. The

space existing between drum and jacket thus can be tightened toward the outer air in the range of the spile hole by driving home nut G, so that any penetration of moisture is impossible. At the bung hole jacket A has an annular depression a in which is fixed by welding a reinforcing ring K. The height of ring K is so determined that its outer surface lies flush with shell A. Ring K has screwed into it a socket M projecting through an a rture, surrounded b an inwardl bent ange a, of shell 0. n flange c 'is xed by welding a reinforcing ring N having internal threads engaged by an intermediate ring P. The latter surrounds socket M and rests on ring K. A further ring Q, rests on the intermediate ring P and is screwed onto socket M. In this manner the space existing between drum and jacket is so tightened in the range of the bung hole that any moisture cannot penetrate.

In manufacturing the described metal 100 drum one proceeds in the following manner. The proper drum is manufactured first and separa'tel together with the parts rigidly connecte thereto, the same is the case with the jacket, except thewall D, carrying socket F, and the round flange After having mounted on socket F, the intermediate rin H, drum A B is slid into jacket C D, w ereupon drum and jacket are interconnected in the range oi the spile hole and bung hole by driving home the respective threaded parts. Thereupon the other front wall D of the jacket is slid so far into shell C asvto firmly rest on drum A B and is tightly welded with shell C, and also the 0p osite front wall D. The formation, then ibllowing, of the round flange c terminates the manufacture of the metal drum. Y As'it will be seen from the foregoing, an air layer exists almost everywhere between drum and jacket which air layer sufliciently rotects the content of the drum, e. g. beer, rom heat or cold.. The proper drum further possesses a sufiicient own strength and is protected in a very simple manner from any displacement within the jacket owing to its abutting on the respective portions of the jacket on the ends of its shell portion, on its periphery, and in the midst of its front walls, so that the connections, situated in the range of the "drum holes, between drum and jacket are not stressed as to their' strength and a permanent tight condition is secured. The connection between drum and 'acket becomes more intimate still by the anges and the appurtenant edges of drum shell A projecting into the annular gap existing between the parts d and 0 By this 40 arrangement further the structural lengthof the metal drum is reduced:

Owing to thezsocket being screwed into the proper drum that means being detachably connected thereto, and due to the reinforcing ring K lying flush with the outer side of shell A, the roper drum A B can be slid into jacket 6 D without any :difli- -culty. Finally, the fact that the intermediate ring P resting on-iing K which belon s to the proper drum A B is arranged within flange c affords the advantage of the lproper drum A B in the range of the bung ole having no outwardly projecting parts.

I claim:

drum havin end walls and a substantially cylindrical s ell, and of a jacket having end walls andra barreled shell, an outwardly ex -'?te1rdi"ng flange arranged on each of the end walls of sai proper drum and connected to the respective shell by welding, the end walls of said jacket having a diametersmaller than 1. A metal drum consisting of a proper as to form a ap near the edge of said jacket end walls, t e welded ends of said inner drum and its end wall flanges being lodged j cylindrical shell and of 'a jacket'ha'ving end walls and a barreled shell, the proper drum being constructedas a unit independent of said jacket and firmly held within said jacket solely by the endsof the shell of said proper drum abutting on the ends of the shell of said jacket and the end walls'of the pro er drum abuttingon the end walls of the acket whereby the end walls of the proper drum are substantially protected rom being .bellied.- .3 I

3. In a metaldrum according-to} claim 2, an outwardly extending flange arranged on each of the end walls of said proper drum and connected to the respective shell by welding, theflend walls of said jackets having a diameter smaller than the inner diameter of the: jacket shell, an outwardly extending flange arranged onfeach; of said jacket end walls and step ed; so as to form a gap near the edge ofsai jacket endrwalls, the welded ends of said inner drum and its end wall flanges being lodged in said. ga s.

The foregoing spec1ficationsigned at (lblogn'e, Germany, this 14th day of March,

1929. p v .7 JULIUS 'KNIGGE.

the inner diameter of the j acket shell, an outw v wardly extending flange arranged on each 65 of said jacket end walls and stepped so 

